Favor `unless` over `if` for negative conditions
(or control flow ||).

See #17478

In 8278b763 the default behaviour of annotation
has changes, which was causing a lot of noise in diffs. We decided in #17382
that it is better to get rid of the whole annotate gem, and instead let people
look at schema.rb for the columns in a table.

Fixes: #17382

We can just use "arel_table" in these cases instead of
"SomeClass.arel_table".

- add feature to list runners
- add feature to show runners details
- add feature to delete runner
- add feature to update runner

Signed-off-by: NDmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Slightly refactor runner status detection: moving it to Runner class
Signed-off-by: NKamil Trzcinski <ayufan@ayufan.eu>